The Stephen Mulhern-hosted quiz show seemed to be borrowing humour from ITV chum Keith Lemon with this hilarious clip.

Emma Willis, David Walliams and Kimberley Walsh brought their mums along to win cash for charity on the show's Mother's Day special, but found themselves red-faced after a clue turned blue.

We won't ruin the surprise, but when Emma removed a tile, there appeared to be some not so family friendly activities occurring.

The Big Brother host couldn't stop giggling, while David reached over to cover his mum's eyes.

AWKWARD: Emma's choice of tile uncovered a hilarious scene [ITV]

Stephen's squirming turned to hysterical laughter after David joked: "Stephen, it's not a chance for you to show your home videos."

The comedian also teased Emma, saying: "You must have seen this before somewhere."

Luckily for the censors and ITV's complaints department, Emma and her mum chose not to guess what was going on in the picture, with the star saying: "I'm just gonna put it out there – I'm not going to say what I think I see."

BLUE CLUE: David didn't want his mum watching the puzzle [ITV]

This unfortunate tile placement echoes the famous "Snake Charmer" incident.

During an episode hosted by Roy Walker in 1994, the audience was left in stitches after a puzzle involving Mr Chips was uncovered in quite an awkward manner.

The clip features regularly on blooper shows – and we're thinking this latest incident may end up joining it.

If you watch Catchphrase with your old dear this weekend, maybe plan a strategic trip to put the kettle on during this segment.